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The body of the trichocyst is composed of a core and a cortex which
have slightly different electron diffracting properties, thus the
cortex is darker since it scatters more electrons. An electron
transparent zone surrounds the cortex and separates the trichocyst
membrane from the body. The trichocyst tip is composed of a central
spike covered by a sheath. The spike is nail-shaped with its “head”
resting on the trichocyst body. The trichocyst membrane completely
surrounds both trichocyst body and sheath. (Details of trichocyst fine
structure were recorded by Bannister, J. Cell Sci. 11:899-929, 1972.)
EM taken on 4/6/78 by R. Allen with Hitachi HU11A TEM. Neg. 14,750X.
Bar = 0.5µm.
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